March 20th, 2018, 10:05 AM  #1 
Member Joined: Sep 2011 Posts: 98 Thanks: 1  Vector Algebra
Hi, I have encountered difficulties with part (b), (c) and (e). Help is much appreciated. Thanks 
March 20th, 2018, 10:30 AM  #2 
Senior Member Joined: Mar 2015 From: New Jersey Posts: 1,603 Thanks: 115 
b) a=0 or b=0 or both or a and b are perpendicular c) a=0 or b and c =0 or b = c e) a=0 or b=0 or both or a and b are perpendicular. 

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algebra, vector 
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